CN115164300A - Method and device for controlling oil return of air conditioner, air conditioner and storage medium - Google Patents
Method and device for controlling oil return of air conditioner, air conditioner and storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 82
- 230000001105 regulatory effect Effects 0.000 claims abstract description 66
- 239000003507 refrigerant Substances 0.000 claims abstract description 62
- 239000007788 liquid Substances 0.000 claims description 32
- 238000012937 correction Methods 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 5
- 238000004378 air conditioning Methods 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000001276 controlling effect Effects 0.000 abstract description 21
- 239000003921 oil Substances 0.000 description 136
- 238000010586 diagram Methods 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000004422 calculation algorithm Methods 0.000 description 1
- 239000010725 compressor oil Substances 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The application relates to the technical field of intelligent household appliances, and discloses a method for controlling oil return of an air conditioner, which comprises the following steps: at frequency f of oil return in inverter compressor 2 Under the condition of operation, periodically detecting the indoor temperature; calculating the indoor temperature T of the current period 1 And the room temperature T of the previous period 1s Temperature difference Δ T of 1 (ii) a According to temperature difference DeltaT 1 Determining an increase value K of a valve opening of a capacity control valve Z (ii) a According to the increase value K Z And adjusting the valve opening degree of the large-capacity adjusting valve to distribute the refrigerant flowing out of the oil separator. The method can reduce the refrigerant flowing to the heat exchanger by increasing the valve opening of the capacity regulating valve no matter what mode the air conditioner operates in and under the condition that the frequency of the compressor is forced to rise and enter the oil return operation, thereby reducing the temperature fluctuation of the heat exchanger and further reducing the indoor temperature fluctuation. The application also discloses a device, an air conditioner and a storage medium for controlling the oil return of the air conditioner.
Description
Technical Field
The application relates to the technical field of intelligent household appliances, in particular to a method and a device for controlling oil return of an air conditioner, the air conditioner and a storage medium.
Background
At present, after the variable frequency air conditioner runs at a low frequency for a certain time, the running frequency of a compressor needs to be improved to realize oil return control of the compressor. The control mode improves the reliability of the unit, and simultaneously leads to the excessive output of cold or heat, so that the problem of shock cooling or shock heating generated by indoor temperature is caused, and the comfort of users is influenced.
In order to solve the problem of indoor temperature fluctuation under the condition of oil return operation of the variable frequency air conditioner compressor, the related technology discloses an oil return control method of the variable frequency air conditioner compressor. The method comprises the following steps: when the variable-frequency air conditioner compressor performs oil return operation, the current frequency of the compressor is adjusted to be oil return frequency, and meanwhile, the matched auxiliary heat source is increased according to the difference value of the oil return frequency and the current frequency to increase the ambient temperature so as to offset the output capacity of the compressor increased in frequency during the oil return operation.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
the technology can only solve the temperature fluctuation caused by the oil return operation condition of the compressor when the variable frequency air conditioner operates in a refrigerating mode, and cannot solve the temperature fluctuation caused by the oil return operation of the compressor in a heating and air supply operation mode of the variable frequency air conditioner.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a method and a device for oil return control of an air conditioner, the air conditioner and a storage medium, so that indoor temperature fluctuation can be reduced when the air conditioner enters oil return operation in multiple operation modes.
In some embodiments, an air conditioner includes: the variable frequency compressor comprises an exhaust port and a return port; the gas-liquid separator comprises a first gas inlet and a first gas outlet, the first gas outlet is communicated with the gas return port, and a refrigerant from the outdoor heat exchanger or the indoor heat exchanger firstly flows through the first gas inlet and enters the gas-liquid separator; the oil separator comprises a second air inlet, a second air outlet and a liquid outlet, the second air inlet is communicated with the air outlet, a refrigerant passing through the oil separator is sent into the outdoor heat exchanger or the indoor heat exchanger through the second air outlet, and the liquid outlet is communicated with the air return port through a filter and an oil return electromagnetic valve and used for returning oil to the variable frequency compressor. The air conditioner further includes: one end of the capacity regulating valve is connected with the first air inlet through a pipeline, and the other end of the capacity regulating valve is connected with the second air outlet through a pipeline; the method comprises the following steps: at frequency f of oil return in inverter compressor 2 Under the condition of operation, periodically detecting the indoor temperature; calculating the indoor temperature T of the current period 1 And the indoor temperature T of the previous cycle 1s Temperature difference Δ T of 1 (ii) a According to temperature difference DeltaT 1 Determining an increase value K of a valve opening of a capacity control valve Z (ii) a According to an increase value K Z And adjusting the valve opening degree of the large-capacity adjusting valve to divide the refrigerant flowing out of the oil separator.
In some embodiments, an apparatus for air conditioner oil return control includes: a detection module configured to periodically detect an indoor temperature; a calculation module configured to calculate an indoor temperature T of a current cycle 1 And the room temperature T of the previous period 1s Temperature difference Δ T of 1 (ii) a According to temperature difference DeltaT 1 Determining an increase value K of a valve opening of a capacity control valve Z (ii) a A control module configured to increase by a value K Z And adjusting the valve opening degree of the large-capacity adjusting valve to distribute the refrigerant flowing out of the oil separator.
In some embodiments, an apparatus for air conditioner oil return control includes: a processor and a memory storing program instructions. The processor is configured, upon execution of the program instructions, to perform the aforementioned method for inverter compressor oil return control.
In some embodiments, an air conditioner includes: the variable frequency compressor comprises an exhaust port and a return port; the gas-liquid separator comprises a first gas inlet and a first gas outlet, the first gas outlet is communicated with the gas return port, and a refrigerant from the outdoor heat exchanger or the indoor heat exchanger firstly flows through the first gas inlet and enters the gas-liquid separator; the oil separator comprises a second air inlet, a second air outlet and a liquid outlet, the second air inlet is communicated with the air outlet, a refrigerant passing through the oil separator is sent to the outdoor heat exchanger or the indoor heat exchanger through the second air outlet, and the liquid outlet is communicated with the air return port through a filter and an oil return electromagnetic valve and used for returning oil of the variable frequency compressor; one end of the capacity regulating valve is connected with the first air inlet through a pipeline, and the other end of the capacity regulating valve is connected with the second air outlet through a pipeline; a temperature sensor for detecting an indoor temperature; and the device for controlling oil return of the air conditioner.
In some embodiments, a storage medium stores program instructions. The program instructions, when executed, perform the aforementioned method for air conditioner oil return control.
The method and the device for controlling oil return of the air conditioner, the air conditioner and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:
the output temperature of the air conditioner under the conditions of refrigeration, heating and air supply is in positive correlation with the flow of the refrigerant. In the embodiment of the disclosure, the variable frequency air conditioner divides the refrigerant flowing into the heat exchanger by gradually adjusting the valve opening of the large capacity adjusting valve in the oil return operation process. Therefore, no matter what mode the air conditioner operates in, under the condition that the frequency of the compressor is forced to rise and the air conditioner enters the oil return operation, the temperature fluctuation of the heat exchanger can be reduced by increasing the valve opening degree of the capacity regulating valve, and further the indoor temperature fluctuation is reduced.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a schematic diagram of an air conditioner provided by an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a method for oil return control of an air conditioner according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another method for oil return control of an air conditioner according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another method for oil return control of an air conditioner according to an embodiment of the disclosure;
FIG. 5 is a schematic diagram of another method for oil return control of an air conditioner according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of another method for oil return control of an air conditioner according to an embodiment of the disclosure;
FIG. 7 is a schematic diagram of another method for oil return control of an air conditioner according to an embodiment of the present disclosure;
FIG. 8 is a schematic diagram of an apparatus for oil return control of an air conditioner according to an embodiment of the present disclosure;
fig. 9 is a schematic diagram of another device for oil return control of an air conditioner according to an embodiment of the present disclosure.
Reference numerals:
1: a variable frequency compressor; 2: an oil separator; 3: a four-way valve; 4: an outdoor heat exchanger; 5: an electronic expansion valve; 6: an indoor heat exchanger; 7: a gas-liquid separator; 8: a filter; 9: an oil return electromagnetic valve; 10: a capacity regulating valve.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The term "plurality" means two or more, unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
The term "correspond" may refer to an association or binding relationship, and a corresponding to B refers to an association or binding relationship between a and B.
With reference to fig. 1, an embodiment of the present disclosure provides an air conditioner, including: the variable-frequency compressor comprises an inverter compressor 1, an oil separator 2, a four-way valve 3, an outdoor heat exchanger 4, an electronic expansion valve 5, an indoor heat exchanger 6, a gas-liquid separator 7, a filter 8, an oil return solenoid valve 9, a capacity regulating valve 10, a temperature sensor (not shown in the figure) and a controller (not shown in the figure). The variable frequency compressor 1, the oil separator 2, the four-way valve 3, the outdoor heat exchanger 4, the electronic expansion valve 5, the indoor heat exchanger 6 and the gas-liquid separator 7 are connected through pipelines to form a refrigerant circulation loop. Under the condition of air conditioner refrigeration operation, high-temperature and high-pressure gaseous refrigerant discharged from the variable frequency compressor 1 flows to the outdoor heat exchanger 4 through the oil separator 2 and the four-way valve 3 (which can be reversed, and at the moment, the refrigerant is communicated) to exchange heat, and the high-pressure gaseous refrigerant is converted into high-pressure liquid refrigerant. Then, the high-pressure liquid refrigerant flows through the electronic expansion valve 5, is throttled and depressurized, enters the indoor heat exchanger 6, and is subjected to heat exchange in the indoor heat exchanger 6 to be converted into a low-temperature low-pressure gaseous refrigerant. Finally, the low-temperature low-pressure gaseous refrigerant returns to the variable-frequency compressor 1 through the four-way valve 3 and the gas-liquid separator 7. In the case of heating operation of the air conditioner, a high-temperature and high-pressure gaseous refrigerant discharged from the inverter compressor 1 flows to the indoor heat exchanger 6 through the oil separator 2 and the four-way valve 3 (which may be reversed, and in this case, in a connected heating state) to exchange heat, and the high-pressure gaseous refrigerant is converted into a high-pressure liquid refrigerant. Then, the high-pressure liquid refrigerant passes through the electronic expansion valve 5 to be throttled and decompressed, enters the outdoor heat exchanger 4, and is subjected to heat exchange in the outdoor heat exchanger 4 to be converted into a low-temperature low-pressure gaseous refrigerant. Finally, the low-temperature low-pressure gaseous refrigerant returns to the variable-frequency compressor 1 through the four-way valve 3 and the gas-liquid separator 7.
The oil separator 2, the filter 8 and the oil return electromagnetic valve 9 are connected through pipelines to form an oil return oil path. In the case of the oil-return operation of the air conditioner, the operation frequency of the inverter compressor 1 increases, and the lubricating oil in the oil separator 2 returns to the inverter compressor 1 through the filter 8 and the oil-return electromagnetic valve 9.
One end of the capacity control valve 10 is connected between the four-way valve and the oil separator through a pipeline, and the other end is connected between the four-way valve and the gas-liquid separator through a pipeline. The capacity adjustment valve 10 may divide the refrigerant flowing to the indoor heat exchanger 6 or the outdoor heat exchanger 4. In addition, a controller (not shown) of the air conditioner may adjust the opening degree of the capacity adjustment valve 10 according to the indoor temperature detected by a temperature sensor (not shown). The capacity regulating valve 10 is a valve capable of stepless opening adjustment, and different specifications of the capacity regulating valve 10 can be determined according to different air conditioner product performances. In some embodiments, the opening degree of the capacity adjustment valve 10 may range from 0 to 1200 steps.
In conjunction with the air conditioner shown in fig. 1, an embodiment of the present disclosure provides a method for oil return control of an air conditioner. As shown in fig. 2, the method includes:
s201, in the frequency conversion compressor, the oil return frequency f 2 In the operating state, the temperature sensor periodically detects the indoor temperature. The period for detecting the indoor temperature may be set as needed, and may be 1s, 2s, or the like.
S202, the controller calculates the indoor temperature T of the current period 1 And the room temperature T of the previous period 1s Temperature difference Δ T of 1 。
S203, the controller controls the temperature according to the temperature difference delta T 1 Determining an increase value K of a valve opening of a capacity control valve Z 。
S204, the controller increases the value K Z And adjusting the valve opening degree of a capacity adjusting valve, wherein the capacity adjusting valve is used for shunting the refrigerant flowing out of the oil separator.
It is understood that the valve opening degree of the capacity adjustment valve is adjusted every detection period of the indoor temperature.
By adopting the method, the valve opening degree of the large-capacity regulating valve can be gradually regulated in the oil return operation process of the variable frequency air conditioner, so that more refrigerants are shunted. No matter what mode the air conditioner is operated in, under the condition that the frequency of the compressor is forced to rise to carry out oil return control, the opening degree of the capacity regulating valve can be increased to reduce the refrigerant flowing to the heat exchanger. Thus, the temperature fluctuation of the heat exchanger can be reduced, and the indoor temperature fluctuation can be further reduced.
Alternatively, Δ T 1 The larger the value of K is Z The larger. Thus, the larger the temperature change, the larger the opening of the displacement control valve is adjusted by the controller. Therefore, more refrigerants flowing to the heat exchanger can be reduced, and temperature fluctuation is rapidly reduced.
Optionally, the controller is responsive to the temperature difference Δ T 1 Determining an increase value K of a valve opening of a capacity control valve Z The method comprises the following steps: controller based on temperature difference delta T 1 Calculating the current temperature fluctuation ratio beta of the indoor temperature 1 (ii) a The controller is used for controlling the temperature fluctuation rate beta according to the current temperature 1 Calculating an increase value K of a valve opening of a capacity adjustment valve Z 。
Optionally, the controller is responsive to the temperature difference Δ T 1 Calculating the current temperature fluctuation rate beta of the indoor temperature 1 The method comprises the following steps: controller calculation
Wherein, Δ T is the air conditioning control accuracy.
Optionally, the controller varies the rate of fluctuation β according to the current temperature 1 Calculating an increase value K of a valve opening of a capacity adjustment valve Z The method comprises the following steps: controller calculates K Z ＝m×β 1 And m is a default correction coefficient of the opening degree of the capacity regulating valve. Wherein, the value of m can be optimized and adjusted according to the test conditions of different air conditioner products, is not a fixed value, and is usually (0, 1) in the value range]. Alternatively, m is 0.3, 0.5, 0.8, or 1. Thus, different correction coefficients can be set according to the performance of different products. Through the combined calculation of the temperature fluctuation rate and the correction coefficient, the valve opening of the capacity regulating valve can be fed back and adjusted in real time, and the large fluctuation of the temperature is avoided.
Optionally, the controller is responsive to the temperature difference Δ T 1 Determining an increase value K of a valve opening of a capacity regulating valve Z The method comprises the following steps: controller calculates K Z ＝n×∣ΔT 1 | n is a default correction coefficient for the opening of the capacity adjustment valve. Wherein, the value of n can be optimized and adjusted according to the test conditions of different air conditioner products, is not a fixed value, and is usually (0, 1) in the value range]. Alternatively, n is 0.3, 0.5, 0.8, or 1. Thus, different correction coefficients can be set according to the performance of different products. Through the combination calculation of the periodic temperature change and the correction coefficient, the valve opening of the capacity regulating valve can be fed back and adjusted in real time, and the large fluctuation of the temperature is avoided.
Optionally, after each time the valve opening of the capacity adjustment valve is adjusted, the method further comprises: the controller judges whether an oil return operation exit condition is reached or not; under the condition of reaching the condition of exiting oil return operation, the controller reduces the operation frequency of the variable frequency compressor to the operation of the compressor before oil returnFrequency f 1 。
With reference to fig. 3, another method for controlling oil return of an air conditioner according to an embodiment of the present disclosure includes:
s301, performing frequency conversion on the frequency conversion compressor at an oil return frequency f 2 In the operating condition, the controller controls the temperature sensor to periodically detect the indoor temperature. The period for detecting the indoor temperature may be set as required, and may be 1s, 2s, or the like.
S302, the controller calculates the indoor temperature T of the current period 1 And the room temperature T of the previous period 1s Temperature difference Δ T of 1 。
S303, the controller is used for controlling the temperature difference delta T 1 Determining an increase value K of a valve opening of a capacity control valve Z 。
S304, the controller increases the value K Z And adjusting the valve opening degree of the capacity adjusting valve, wherein the capacity adjusting valve divides the refrigerant flowing out of the oil separator.
S305, after adjusting the valve opening of the capacity adjustment valve each time, the controller determines whether or not the oil return operation exit condition is reached.
S306, under the condition that the oil return operation quit condition is achieved, the controller reduces the operation frequency of the variable frequency compressor to the operation frequency f of the compressor before oil return 1 。
It is to be understood that in the case where the oil-return operation exit condition is not reached, the controller cyclically executes steps S301 to S305.
By adopting the method for controlling the oil return of the air conditioner, the valve opening degree of the large-capacity regulating valve can be gradually regulated in the oil return operation process of the variable frequency air conditioner, so that more refrigerants are shunted. No matter what mode the air conditioner is operated in, under the condition that the frequency of the compressor is forced to rise and the air conditioner enters the oil return operation, the opening degree of the capacity regulating valve can be increased to reduce the refrigerant flowing to the heat exchanger. Thus, the temperature fluctuation of the heat exchanger can be reduced, and the indoor temperature fluctuation can be further reduced.
Optionally, the compressor operating frequency f before the controller reduces the operating frequency of the inverter compressor to the oil return 1 Then, the method further comprises:the controller controls the temperature sensor to periodically detect the indoor temperature; the controller calculates the indoor temperature T of the current period 2 And the room temperature T of the previous period 2s Temperature difference Δ T of 2 (ii) a Controller based on temperature difference delta T 2 Determining a reduction value K of a valve opening of a capacity control valve j (ii) a The controller decreasing by a value K j The valve opening degree of the capacity regulating valve is reduced, and the capacity regulating valve gradually reduces the flow distribution of the refrigerant flowing out of the oil separator; the controller stops adjusting the valve opening degree of the capacity adjustment valve when the valve opening degree of the capacity adjustment valve is adjusted to the initial closing valve opening degree.
After exiting the oil return operation, the compressor operating frequency is reduced to the pre-oil return operating frequency. At this time, the refrigerant flowing to the heat exchanger is reduced while the capacity adjustment valve is still maintained at a large valve opening. The valve opening of the capacity regulating valve is gradually reduced according to the indoor temperature change, and the refrigerant flowing to the heat exchanger is increased. Therefore, the temperature fluctuation of the heat exchanger after the oil return operation is quitted can be reduced, and the indoor temperature fluctuation is further reduced.
With reference to fig. 4, another method for controlling oil return of an air conditioner according to an embodiment of the present disclosure includes:
s401, in the frequency conversion compressor, the oil return frequency f 2 In the operating condition, the controller controls the temperature sensor to periodically detect the indoor temperature. The period for detecting the indoor temperature may be set as required, and may be 1s, 2s, or the like.
S402, the controller calculates the indoor temperature T of the current period 1 And the room temperature T of the previous period 1s Temperature difference Δ T of 1 。
S403, the controller controls the temperature according to the temperature difference delta T 1 Determining an increase value K of a valve opening of a capacity control valve Z 。
S404, the controller increases the value K Z And adjusting the valve opening degree of a capacity adjusting valve, wherein the capacity adjusting valve is used for shunting the refrigerant flowing out of the oil separator.
And S405, after the valve opening of the capacity regulating valve is regulated each time, judging whether an oil return operation quitting condition is met by the controller.
S406, atWhen the condition that the oil return operation quits is achieved, the controller reduces the operation frequency of the variable frequency compressor to the operation frequency f of the compressor before oil return 1 。
And S407, the controller controls the temperature sensor to periodically detect the indoor temperature.
S408, the controller calculates the indoor temperature T of the current period 2 And the indoor temperature T of the previous cycle 2s Temperature difference Δ T of 2 。
S409, the controller adjusts the temperature difference delta T 2 Determining a reduction value K of a valve opening of a capacity control valve j 。
S410, the controller decreases the value K j The valve opening degree of the capacity regulating valve is reduced. The capacity regulating valve gradually reduces the split flow of the refrigerant flowing out of the oil separator.
In S411, when the valve opening degree of the capacity adjustment valve is adjusted to the initial closing valve opening degree, the controller stops adjusting the valve opening degree of the capacity adjustment valve. Specifically, the initial closing valve opening degree of the capacity regulating valve is not necessarily all closed. The initial closing valve opening degree of the capacity control valve is different depending on the capacity control valve. The initial closing valve opening degree of the capacity adjustment valve is usually between 0 and 50 steps. Alternatively, the initial closing valve opening degree of the capacity adjustment valve may be 0 step, 10 steps, 30 steps, or 50 steps.
It is understood that in the case where the oil-return operation exit condition is not reached, the controller executes steps S401 to S405 in a loop.
By adopting the method for controlling the oil return of the air conditioner, the valve opening degree of the large-capacity regulating valve can be gradually regulated in the oil return operation process of the variable frequency air conditioner, so that more refrigerants are shunted. No matter what mode the air conditioner operates in, under the condition that the frequency of the compressor is forced to rise and the air conditioner enters the oil return operation, the opening degree of the capacity regulating valve can be increased to reduce the refrigerant flowing to the heat exchanger. Thus, the temperature fluctuation of the heat exchanger can be reduced, and the indoor temperature fluctuation can be further reduced. After exiting the oil return operation, the compressor operating frequency is reduced to the pre-oil return operating frequency. At this time, the refrigerant flowing to the heat exchanger is reduced while the capacity adjustment valve is still maintained at a large valve opening. The valve opening of the capacity regulating valve is gradually reduced according to the indoor temperature change, and the refrigerant flowing to the heat exchanger is increased. Therefore, the temperature fluctuation of the heat exchanger after the oil return operation is quitted can be reduced, and the indoor temperature fluctuation is further reduced.
Alternatively, Δ T 2 The greater the value K is j The larger. After the oil return operation is quitted, the operation frequency of the compressor is reduced, and the refrigerant flowing to the heat exchanger is reduced. When the temperature change is larger, the larger the valve opening of the capacity adjustment valve is adjusted by the controller, the more the refrigerant can be made to flow to the heat exchanger. Thereby quickly reducing the temperature fluctuation after the oil return operation is quitted.
Optionally, the controller is responsive to the temperature difference Δ T 2 Determining a reduction value K of a valve opening of a capacity control valve j The method comprises the following steps: controller based on temperature difference delta T 2 Calculating the current temperature fluctuation rate beta of the indoor temperature 2 (ii) a The controller is used for controlling the temperature fluctuation rate beta according to the current temperature 2 Calculating a reduction value K of a valve opening degree of a capacity regulating valve j 。
Optionally, the controller is responsive to the temperature difference Δ T 2 Calculating the current temperature fluctuation rate beta of the indoor temperature 2 The method comprises the following steps: controller calculation
Wherein, Δ T is the air conditioning control accuracy.
Optionally, the controller varies the rate of fluctuation β according to the current temperature 2 Calculating a reduction value K of a valve opening of a capacity adjustment valve j The method comprises the following steps: controller calculates K j ＝m×β 2 And m is a default correction coefficient of the opening degree of the capacity regulating valve. Wherein, the value of m can be optimized and adjusted according to the test conditions of different air conditioner products, is not a fixed value, and is usually (0, 1)]. Alternatively, m is 0.3, 0.5, 0.8, or 1. Thus, different correction coefficients can be set according to the performance of different products. Through the combined calculation of the temperature fluctuation rate and the correction coefficient, the valve opening degree of the capacity regulating valve can be fed back and adjusted in real time, and the temperature is prevented from generating large fluctuation.
Optionally, the controller varies the rate of fluctuation β according to the current temperature 2 Calculating capacityReduction value K of valve opening of quantity regulating valve j The method comprises the following steps: controller calculates K j ＝n×∣ΔT 2 | n is a default correction coefficient for the opening of the capacity adjustment valve. Wherein, the value of n can be optimized and adjusted according to the test conditions of different air conditioner products, is not a fixed value, and is usually (0, 1) in the value range]. Alternatively, n is 0.3, 0.5, 0.8, or 1. Thus, different correction coefficients can be set according to the performance of different products. Through the combination calculation of the periodic temperature change and the correction coefficient, the valve opening of the capacity regulating valve can be fed back and adjusted in real time, and the large fluctuation of the temperature is avoided.
With reference to fig. 5, another method for controlling oil return of an air conditioner according to an embodiment of the present disclosure includes:
s501, the controller controls the variable frequency compressor to enter oil return operation.
And S502, after the controller controls the variable frequency compressor to enter oil return operation, the controller controls the temperature sensor to periodically detect the indoor temperature. The period for detecting the indoor temperature may be set as required, and may be 1s, 2s, or the like.
S503, the controller calculates the indoor temperature T of the current period 1 And the room temperature T of the previous period 1s Temperature difference Δ T of 1 。
S504, the controller controls the temperature difference delta T 1 Determining an increase value K of a valve opening of a capacity control valve Z 。
S505, the controller increases the value K Z The valve opening degree of the large-capacity regulating valve is regulated. The capacity regulating valve divides the refrigerant flowing out of the oil separator.
S506, after adjusting the valve opening of the capacity adjustment valve each time, the controller determines whether an oil return operation exit condition is reached. If yes, go to step S507; otherwise, the procedure returns to step S502 to step S506.
And S507, the controller controls the variable frequency compressor to quit oil return operation.
By adopting the method for controlling the oil return of the air conditioner, which is provided by the embodiment of the disclosure, the valve opening degree of the large-capacity regulating valve can be gradually regulated in the oil return operation process of the variable frequency air conditioner, so that more refrigerants are shunted. No matter what mode the air conditioner is operated in, under the condition that the frequency of the compressor is forcibly increased to carry out oil return control, the opening degree of the capacity regulating valve is increased to reduce the refrigerant flowing to the heat exchanger. Thus, the temperature fluctuation of the heat exchanger can be reduced, and the indoor temperature fluctuation can be further reduced.
With reference to fig. 6, another method for oil return control of an air conditioner according to an embodiment of the present disclosure includes:
and S601, controlling the variable frequency compressor to enter oil return operation by the controller.
And S602, after the controller controls the variable frequency compressor to enter oil return operation, the controller controls the temperature sensor to periodically detect the indoor temperature. The period for detecting the indoor temperature may be set as required, and may be 1s, 2s, or the like.
S603, the controller calculates the indoor temperature T of the current period 1 And the indoor temperature T of the previous cycle 1s Temperature difference Δ T of 1 。
S604, the controller controls the temperature difference delta T 1 Determining an increase value K of a valve opening of a capacity control valve Z 。
S605, the controller increases the value K Z The valve opening degree of the large-capacity regulating valve is regulated. The capacity regulating valve divides the refrigerant flowing out of the oil separator.
S606, after executing steps S602 to S605 each time, the controller determines whether or not an oil return operation exit condition is reached. If yes, go to step S607; otherwise, the procedure returns to step S602-S606.
And S607, the controller controls the inverter compressor to quit the oil return operation.
And S608, after the controller controls the variable frequency compressor to quit oil return operation, the controller controls the temperature sensor to periodically detect the indoor temperature. The period for detecting the indoor temperature may be set as required, and may be 1s, 2s, or the like.
S609, the controller calculates the indoor temperature T of the current period 2 And the room temperature T of the previous period 2s Temperature difference Δ T of 2 。
S610, controller rootAccording to temperature difference Delta T 2 Determining a reduction value K of a valve opening of a capacity regulating valve j 。
S611, the controller decreases the value K j The valve opening degree of the capacity regulating valve is reduced.
S612, the controller determines whether the current valve opening degree of the capacity adjustment valve reaches the initial closing valve opening degree each time steps S608 to S611 are executed. If so, go to step S613; otherwise, returning to continue executing steps S608-S612.
And S613, automatically adjusting the running frequency of the compressor by the controller according to the load change of the room temperature.
By adopting the method for controlling the oil return of the air conditioner, the valve opening degree of the large-capacity regulating valve can be gradually regulated in the oil return operation process of the variable frequency air conditioner, so that more refrigerants are shunted. No matter what mode the air conditioner is operated in, under the condition that the frequency of the compressor is forcibly increased to carry out oil return control, the opening degree of the capacity regulating valve is increased to reduce the refrigerant flowing to the heat exchanger. Thus, the temperature fluctuation of the heat exchanger can be reduced, and the indoor temperature fluctuation can be further reduced. After exiting the oil return operation, the compressor operating frequency is reduced to the pre-oil return operating frequency. At this time, the refrigerant flowing to the heat exchanger is reduced while the capacity adjustment valve is still maintained at a large valve opening. The valve opening of the capacity regulating valve is gradually reduced according to the indoor temperature change, and the refrigerant flowing to the heat exchanger is increased. Therefore, the temperature fluctuation of the heat exchanger after the oil return operation is quitted can be reduced, and the indoor temperature fluctuation is further reduced.
Under the condition that the air conditioner starts to operate, a user sets a target temperature T m And the air conditioner detects the indoor temperature T in real time through the temperature sensor. At T ≧ T m And + Δ T, the air conditioner starts cooling operation. At T ≦ T m In case of- Δ T, the air conditioner starts heating operation. At T m -ΔT＜T＜T m + Δ T, the air conditioner starts the air supply operation. Wherein, Δ T is the air conditioning control accuracy.
In the actual operation process of the air conditioner, the method for controlling oil return of the air conditioner is shown in fig. 7 and comprises the following steps:
and S701, detecting the running frequency f of the compressor in real time.
S702, judging that the running frequency f of the compressor is less than the preset frequency f 0 Whether the accumulated running time length is longer than the preset time length for entering the oil return running during the low-frequency running or not. If yes, go to step S703; otherwise, the procedure returns to step S701-S702. Wherein the predetermined frequency f 0 It is usually set according to the performance of the compressor of the air conditioner. The preset time for the low-frequency operation to enter the oil return operation refers to the time for the low-frequency operation of the compressor before the compressor is forced to be subjected to frequency increasing and enter the oil return operation.
S703, the compressor uses the oil return frequency f 2 And entering oil return operation.
And S704, detecting the indoor temperature at intervals of 1S.
S705, a temperature difference Δ T1 between the indoor temperature of the current cycle and the indoor temperature of the previous cycle is calculated.
S706, according to the formula
Calculating an increase value K of a valve opening of a capacity adjustment valve z . Wherein, assuming that the value of m is 0.8, the value of Δ T is 2, Δ T 1 If the value of (1) is 2, the valve opening of the current capacity regulating valve is increased by a value K z Is composed of
S707, adjusting the valve opening of the capacity adjusting valve to K z 。
S708, after adjusting the valve opening of the capacity adjusting valve each time, judging the oil return frequency f of the compressor 2 Whether the running time reaches the set oil return running time or not. If yes, go to step S710; otherwise, the process returns to step S705 to S709.
S709, reducing the running frequency of the inverter compressor to the running frequency f of the compressor before oil return 1 。
And S710, detecting the indoor temperature at intervals of 1S.
S711, calculating a temperature difference delta T between the indoor temperature of the current period and the indoor temperature of the previous period 2 。
S712, according to the formula
Calculating a reduction value K of a valve opening degree of a capacity regulating valve j . Wherein, assuming that the value of m is 0.8, the value of Δ T is 2, Δ T 2 Is 2, the value K of the decrease in the valve opening of the current capacity regulating valve j Is composed of
S713, adjusting the valve opening of the capacity adjusting valve to K j 。
S714, after the valve opening degree of the capacity adjustment valve is adjusted each time, it is determined whether or not the valve opening degree of the capacity adjustment valve reaches the initial closing valve opening degree. If yes, go to step S715; otherwise, the procedure returns to the step S710 to S714.
And S715, automatically adjusting the running frequency of the compressor according to the load change of the room temperature.
Referring to fig. 8, an apparatus for controlling oil return of an air conditioner according to an embodiment of the present disclosure includes a detection module 81, a calculation module 82, and a control module 83. The detection module 81 is configured to periodically detect the indoor temperature. The calculation module 82 is configured to calculate the indoor temperature T of the current cycle 1 And the room temperature T of the previous period 1s Temperature difference Δ T of 1 (ii) a According to the temperature difference DeltaT 1 Determining an increase value K of a valve opening of a capacity control valve Z . The control module 83 is configured to increase by a value K Z And adjusting the valve opening degree of the large-capacity adjusting valve to distribute the refrigerant flowing out of the oil separator.
By adopting the device for controlling the oil return of the air conditioner, which is provided by the embodiment of the disclosure, the valve opening degree of the large-capacity regulating valve is gradually adjusted in the oil return operation process of the variable frequency air conditioner, so that more refrigerants are shunted. No matter what mode the air conditioner is operated in, under the condition that the frequency of the compressor is forcibly increased to carry out oil return control, the opening degree of the capacity regulating valve is increased to reduce the refrigerant flowing to the heat exchanger. Thus, the temperature fluctuation of the heat exchanger can be reduced, and the indoor temperature fluctuation can be further reduced.
As shown in fig. 9, an apparatus for oil return control of an air conditioner according to an embodiment of the present disclosure includes a processor (processor) 100 and a memory (memory) 101 storing program instructions. Optionally, the apparatus may also include a Communication Interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other through the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call the logic instructions in the memory 101 to execute the method for air conditioner oil return control of the above embodiment.
In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 101 is a storage medium and can be used for storing software programs, computer executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, that is, implements the method for air conditioner oil return control in the above embodiment.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, memory 101 may include high speed random access memory and may also include non-volatile memory.
The embodiment of the disclosure provides an air conditioner, which comprises a variable frequency compressor, a gas-liquid separator, an oil separator, a capacity regulating valve, a temperature sensor and the device for controlling oil return of the air conditioner. The inverter compressor includes an exhaust port and a return port. The gas-liquid separator comprises a first gas inlet and a first gas outlet, the first gas outlet is communicated with a gas return port of the variable-frequency compressor, and refrigerant from the outdoor heat exchanger or the indoor heat exchanger firstly flows through the first gas inlet and enters the gas-liquid separator. The oil separator comprises a second air inlet, a second air outlet and a liquid outlet, the second air inlet is communicated with an air outlet of the variable-frequency compressor, a refrigerant passing through the oil separator is sent into the outdoor heat exchanger or the indoor heat exchanger through the second air outlet, and the liquid outlet is communicated with a return air port of the variable-frequency compressor through a filter and an oil return electromagnetic valve and used for returning oil to the variable-frequency compressor. One end of the capacity regulating valve is connected with the first air inlet of the gas-liquid separator through a pipeline, and the other end of the capacity regulating valve is connected with the second air outlet of the oil separator through a pipeline. The temperature sensor is used for detecting the indoor temperature.
The embodiment of the disclosure provides a storage medium, which stores program instructions configured to execute the method for oil return control of an air conditioner.
The storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium. A non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and the drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising a" \8230; "does not exclude the presence of additional like elements in a process, method or apparatus comprising the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (11)
1. A method for oil return control for an air conditioner, the air conditioner comprising: the variable frequency compressor comprises an exhaust port and a return port; the gas-liquid separator comprises a first gas inlet and a first gas outlet, the first gas outlet is communicated with the gas return port, and a refrigerant from the outdoor heat exchanger or the indoor heat exchanger firstly flows through the first gas inlet and enters the gas-liquid separator; the oil separator comprises a second air inlet, a second air outlet and a liquid outlet, the second air inlet is communicated with the air outlet, a refrigerant passing through the oil separator is sent to the outdoor heat exchanger or the indoor heat exchanger through the second air outlet, and the liquid outlet is communicated with the air return port through a filter and an oil return electromagnetic valve and used for returning oil to the variable frequency compressor; characterized in that, the air conditioner still includes: one end of the capacity regulating valve is connected with the first air inlet through a pipeline, and the other end of the capacity regulating valve is connected with the second air outlet through a pipeline; the method comprises the following steps:
at frequency f of oil return in inverter compressor 2 Under the condition of operation, periodically detecting the indoor temperature;
calculating the indoor temperature T of the current period 1 And the indoor temperature T of the previous cycle 1s Temperature difference Δ T of 1 ；
According to temperature difference DeltaT 1 Determining an increase value K of a valve opening of a capacity control valve Z ；
According to an increase value K Z And adjusting the valve opening degree of the large-capacity adjusting valve to divide the refrigerant flowing out of the oil separator.
2. The method of claim 1,
ΔT 1 the larger the value of K is Z The larger.
3. Method according to claim 1, characterized in that said function of temperature difference Δ Τ 1 Determining an increase value K of a valve opening of a capacity regulating valve Z The method comprises the following steps:
according to the temperature difference DeltaT 1 Calculating the current temperature fluctuation rate beta of the indoor temperature 1 ；
According to the current temperature fluctuation ratio beta 1 Calculating an increase value K of a valve opening degree of a capacity regulating valve Z 。
4. Method according to claim 3, characterised in that said function of temperature difference Δ T 1 Calculating the current temperature fluctuation rate beta of the indoor temperature 1 The method comprises the following steps:
computing
Wherein, Δ T is the air conditioning control accuracy.
5. Method according to claim 3, characterised in that said current temperature fluctuation rate β is dependent on 1 Calculating an increase value K of a valve opening of a capacity adjustment valve Z The method comprises the following steps:
calculating K Z ＝m×β 1 ；
Where m is a default correction coefficient of the opening degree of the capacity adjustment valve.
6. Method according to claim 1, characterised in that said function of the temperature difference Δ Τ 1 Determining an increase value K of a valve opening of a capacity control valve Z The method comprises the following steps:
calculating K Z ＝n×∣ΔT 1 ∣；
Where n is a default correction coefficient of the opening degree of the capacity adjustment valve.
7. The method according to any one of claims 1 to 6, further comprising, after each adjustment of the valve opening of the capacity adjustment valve:
judging whether an oil return operation exit condition is met;
under the condition of reaching the condition of exiting oil return operation, reducing the operation frequency of the variable frequency compressor to the operation frequency f of the compressor before oil return 1 。
8. An apparatus for oil return control of an air conditioner, comprising:
a detection module configured to periodically detect an indoor temperature;
a calculation module configured to calculate an indoor temperature T of a current cycle 1 And the room temperature T of the previous period 1s Temperature difference Δ T of 1 (ii) a According to temperature difference DeltaT 1 Determining an increase value K of a valve opening of a capacity control valve Z ；
A control module configured to increase by a value K Z And adjusting the valve opening degree of the large-capacity adjusting valve to distribute the refrigerant flowing out of the oil separator.
9. An apparatus for air conditioner oil return control comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the method for air conditioner oil return control according to any one of claims 1 to 7 when executing the program instructions.
10. An air conditioner comprising:
the variable frequency compressor comprises an exhaust port and a return port;
the gas-liquid separator comprises a first gas inlet and a first gas outlet, the first gas outlet is communicated with the gas return port, and a refrigerant from the outdoor heat exchanger or the indoor heat exchanger firstly flows through the first gas inlet and enters the gas-liquid separator;
the oil separator comprises a second air inlet, a second air outlet and a liquid outlet, the second air inlet is communicated with the air outlet, a refrigerant passing through the oil separator is sent to the outdoor heat exchanger or the indoor heat exchanger through the second air outlet, and the liquid outlet is communicated with the air return port through a filter and an oil return electromagnetic valve and used for returning oil of the variable frequency compressor; it is characterized by also comprising:
one end of the capacity regulating valve is connected with the first air inlet through a pipeline, and the other end of the capacity regulating valve is connected with the second air outlet through a pipeline;
a temperature sensor for detecting an indoor temperature; and (c) and (d),
the apparatus for oil return control of an air conditioner as claimed in claim 9.
11. A storage medium storing program instructions, wherein the program instructions, when executed, perform the method for air conditioner oil return control according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210695302.XA CN115164300B (en) | 2022-06-20 | Method and device for oil return control of air conditioner, air conditioner and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210695302.XA CN115164300B (en) | 2022-06-20 | Method and device for oil return control of air conditioner, air conditioner and storage medium |
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| CN115164300A true CN115164300A (en) | 2022-10-11 |
| CN115164300B CN115164300B (en) | 2024-07-09 |
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